If the barrels were something like Siemens-Martin steel, Buturlin cited studies conducted at TOZ (Tula Arms Plant) listing Russian Siemens-Martin tensile strength as 85,300 92,400 psi; modern AISI 1040 gun barrel steel is 95,000-100,000.
I believe the concern on the part of gunsmiths is liability should something like this happen

Asymmetric obstructional 'ring bulge' related to the addition thickness of the brazed barrel flats and support of the right barrel

For a right hander, that chunk of chamber would go right past the left eye
And neither magnetic particle imaging nor radiography could show microscopic voids in the repaired bulge barrel wall